Mesoscopic and Condensed Matter Physics

Biography

Biography: Majid Niaz Akhtar

Abstract

The influence of Cu-Zn substitution on the structural and morphological characteristics of Ni nanocrystalline ferrites have been discussed in this work. The detailed and systematic magnetic characterizations were also done for  Cu-Zn substituted Ni nanoferrites. The nanocrystalline ferrites of Cu-Zn with different compositions were synthesized using sol gel self combustion hybrid method. X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Transmission electron microscope (TEM) and Vibrating sample magnetometer (VSM) were used to find out the properties of CuZn substituted nanocrystalline ferrites. Single phase structure of CuZn substituted in Ni nanocrystalline ferrites were investigated for all the samples. Crystallite size, lattice constant and volume of the cell were found to be increased by increasing Cu contents in spinel structure.  The better morphology with well organized nanocrystals of CuZn ferrites at x=0 and 1.0 were observed from both FESEM and TEM analysis. The average grain size was 35-46 nm for all prepared nanocrystalline samples. Magnetic properties such as coercivity, saturation, remanence, magnetic squareness, magneto crystalline anisotropy constant (K) and Bohr magneton were measured from the recorded hysterises MH loops. The magnetic saturation and remanence were increased as Cu contents increased. However, coercivity follow the Stoner-Wolforth model except for x=0.6 which may be due to the site occupancy and replacement of Cu contents from octahedral site. The squareness ratio confirms the superparamgentic behaviour of the CuZn substituted in Ni nanocrystalline ferrites. Furthermore, CuZn substituted Ni nanocrystalline ferrites may be suitable for many industrial and domestic applications such as component of transformers, core, switching, and MLCI's due to variety of the soft magnetic characteristics.